Revert "wined3d: Preload target in ActivateContext() for ORM_BACKBUFFER/ORM_PBUFFER."

[Stefan Dösinger]

> IMHO this is too little too late. There are at least 2 more calls to
> Preload
> that have exactly the same affect on some of my test games. It sure
> would be
> nice to "fix" at least one case which looks to be common for number of
> games.
I am aware of one. Where is the other one?